[ENHANCEMENT] Custom ingress labels

[kristeey]

Describe the use case:

It would be nice to be able to add labels directly on specific Ingress resources. This is desirable in different usecases e.g. using label filtering with externalDNS in order to create DNS records based on ingresses with a specific label. Atm this is not possible without using the extraLabels attributes for some of the components (not all), but this will add the label on other resources as well.

Describe the enhancement/feature:

E.g. in the operate ingress:

{{- if and .Values.operate.enabled .Values.operate.ingress.enabled -}}
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: {{ include "operate.fullname" . }}
  labels:
    ...
    {{- if .Values.operate.ingress.labels }}
    {{ toYaml .Values.operate.ingress.labels  }}
    {{- end }}

Desired outcome and acceptance tests:

Ability to include specific labels for specific ingresses in the helm chart.